<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body" v-for="(cart,index) in shopCartList" :key="index">
        <ul v-for="(cartInfo) in cart.cartInfoList" :key="cartInfo.id" class="cart-list">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cartInfo.isChecked" @click="changeOneChecked(cartInfo)">
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl">
            <div class="item-msg">{{ cartInfo.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cartInfo.cartPrice }}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeNum(-1,cartInfo)">-</a>
            <input autocomplete="off" type="text" :value="cartInfo.skuNum" minnum="1" class="itxt"
                   @click="changeNum($event.target.value*1-cartInfo.skuNum,cartInfo)">
            <a href="javascript:void(0)" class="plus" @click="changeNum(1,cartInfo)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cartInfo.skuNum * cartInfo.cartPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteOne(cartInfo)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <!--       -->
        <input class="chooseAll" type="checkbox" v-model="isCheckedAll" >
        <span>全选</span>
      </div>
      <div class="option">
        <a href="javascript:;" @click="deleteMore">删除选中的商品</a>
        <a href="javascript:;">移到我的关注</a>
        <a href="javascript:;">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ checkedNum }}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ allMoney }}</i>
        </div>
        <div class="sumbtn">
          <router-link to="/trade" class="sum-btn">结算</router-link>
<!--          <a class="sum-btn" href="###" target="_blank">结算</a>-->
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapState} from "vuex";

export default {
  name: 'ShopCart',
  mounted() {
    this.getShopCart()
  },
  methods: {
    getShopCart() {
      this.$store.dispatch('getShopCart')
    },
    //点击+-和用户的input输入的回调函数
    async changeNum(disNum, cartInfo) {
//disNum是变化的量,传过来是1 -1,$event.target.value*1-cartInfo.skuNum
      //disNum+cartInfo.skuNum是最终的量 比如用户在input框中输入的就是最终的数量
      //最终的值不能小于1 如果小于1 让它等于1
      if (disNum + cartInfo.skuNum < 1) {
        disNum = 1 - cartInfo.skuNum
      }
      try {
        //发请求 需要的是变化的量 disNum  请求成功有后续操作 需要用到try  catch async await
        await this.$store.dispatch('addOrUpdateShopCart', {skuId: cartInfo.skuId, skuNum: disNum})
        alert('修改购物车成功')
        this.getShopCart()//重新获取页面的数据 然后展示数据
      } catch (error) {
        alert('修改购物车数量失败')
      }
    },
    //单选按钮 选中状态切换 需要发请求 修改数据库中的信息 写api store
    async changeOneChecked(cartInfo) {
      try {
        await this.$store.dispatch('getCartOneChecked', {skuId: cartInfo.skuId, isChecked: cartInfo.isChecked ? 0 : 1})
        alert('修改选中状态成功')
        this.getShopCart()//重新发整个页面的请求,然后页面数据
      } catch (error) {
        alert('修改选中状态失败', error.message())
      }
    },
    //删除购物车中的单个商品
   async deleteOne(cartInfo){
      try {
        await this.$store.dispatch('deleteOneCart',cartInfo.skuId)
        alert('删除购物车中的单个商品成功')
        this.getShopCart()
      }catch (e){
        alert('删除购物车中的单个商品失败')
      }

    },
    //删除购物车中的多个商品
   async deleteMore(){
      let skuIds=[]
      this.shopCartList.forEach(item=>{
        item.cartInfoList.forEach(item1=>{
          if (item1.isChecked===1){
            skuIds.push(item1.skuId)
          }
        })
      })
      try {
        await this.$store.dispatch('deleteMoreCart',skuIds)
        alert('删除选中商品成功')
        this.getShopCart()
      }catch (e){
        alert('删除选中商品失败')
      }
    }
  },
  computed: {
    ...mapState({
      shopCartList: state => state.shopCart.shopCartList
    }),
    //计算已选择的商品数量  用到数组的统计方法 reduce
    checkedNum() {
      return this.shopCartList.reduce((prev, item) => {
        prev += item.cartInfoList.reduce((prev1, item1) => {
          if (item1.isChecked) {
            prev1 += item1.skuNum
          }
          return prev1
        }, 0)
        return prev
      }, 0)
    },
    //计算商品总价
    allMoney() {
      return this.shopCartList.reduce((prev, item) => {
        prev += item.cartInfoList.reduce((prev1, item1) => {
          if (item1.isChecked) {
            prev1 += item1.skuNum * item1.cartPrice
          }
          return prev1
        }, 0)
        return prev
      }, 0)
    },
    //计算全选
    isCheckedAll: {
      get() {
          return this.shopCartList.every(item => {
            return item.cartInfoList.every(item1 => {
              return item1.isChecked === 1
            })
          })
      },
      async set(val) {
        //整理发请求携带的参数 skuIds和isChecked
        //val不是我们自己写的  而是修改后的新值,在修改多炫酷的时候 会吧多选框的最新的属性值传递过来
        //val传递过来的值 得转化成0或者是1
        let isChecked = val ? 1 : 0
        let skuIds = []
        this.shopCartList.forEach(item => {
          item.cartInfoList.forEach(item1 => {
            if (item1.isChecked !== isChecked) {
              skuIds.push(item1.skuId)
            }
          })
        })
        try {
          await this.$store.dispatch('getCartAllChecked', {isChecked, skuIds})
         // alert('切换全选状态成功')
          this.getShopCart()
        } catch (error) {
          alert(error.message('切换全选状态失败'))
        }

      }
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }


        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>